/*
 * TextServices / TSDotNet / TSNative
 * Marco Maria Bellocchi, Mauro Bampo
 * Copyright(c) 2013.
 * 
 * The MIT License
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 * 
 */

// MB 19/01/2013: Created

#pragma once
#include "stdafx.h"
#include "Filter.h"

using namespace std;

namespace TSNative {
	
	namespace Filters {

		/// Base class for filters that map 1 input character to 1 output character.
		class CharFilterBase : public Filter {

		public:
			/// Produces a null-terminated output string and returns the number of processed characters.
			/// If the output buffer is too short for a result to be generated, the function should return -1, or a value
			/// greater than the buffer length in resulting FilterState.OutputIndex to signal the processor to reallocate.
			virtual FilterState Process(const char* pInput, int inputLength, char** ppBuffer, int bufferLength, FilterState inputState);
			/// To be implemented in subclasses to implement the actual mapping. A reference to the buffer can be used to look around the current character.
			virtual char ProcessChar(char input, const char* pInput, int inputIndex, int inputLength) = 0;

			virtual int GetInitialBufferLength(int nInputLength);

		};

	}

}